Atmel SAM9X25, Manual

Page: 356 / 1145

356
11054A–ATARM–27-Jul-11
SAM9X25
sro[k] = 0;
}
/* compute difference */
diff = (mu[i] - mu[ro]);
/* compute X ^ (2(mu-ro)) */
for (k = 0; k < (2*NB_ER1); k ++)
{
sro[k+diff] = smu[ro][k];
}
/* multiply by dmu * dmu[ro]^-1 */
for (k = 0; k < 2*NB_ER1; k ++)
{
/* dmu[ro] is not equal to zero by definition */
/* check that operand are different from 0 */
if (sro[k] && dmu[i])
{
/* galois inverse */
sro[k] = gf_antilog[(gf_log[dmu[i]] + (NB_FIELD_ELEMENTS-
gf_log[dmu[ro]]) + gf_log[sro[k]]) % NB_FIELD_ELEMENTS];
}
}
/* multiply by dmu * dmu[ro]^-1 */
for (k = 0; k < 2*NB_ER1; k++)
{
smu[i+1][k] = smu[i][k] ^ sro[k];
if (smu[i+1][k])
{
/* find the order of the polynom */
lmu[i+1] = k << 1;
}
}
}
/* */
/* */
/* End Compute Sigma (Mu+1) */
/* And L(mu) */
/*************************************************/
/* In either case compute delta */
delta[i+1] = (mu[i+1] * 2 - lmu[i+1]) >> 1;
/* In either case compute the discrepancy */
for (k = 0 ; k <= (lmu[i+1]>>1); k++)
{
if (k == 0)
dmu[i+1] = si[2*(i-1)+3];
/* check if one operand of the multiplier is null, its index is -1 */
else if (smu[i+1][k] && si[2*(i-1)+3-k])